Consider using /usr/lib64/qt6/bin/qsb for systems explicitly using lib64

[Endyrm]

When adding the plasmoid on any part of the desktop, it displays the following error:

Error: Failed to load the visual effect. Please choose another visual effect in the configuration dialog.
I've then tried choosing another visual effect as directed, with no luck.

Using the plasmoidviewer utility shows a log that indicates the qsb binary is missing.

When reading through this comment from the plasma 6 port request, you mention the need the need for /usr/lib/qt6/bin/qsb.

The problem? This file only exists under /usr/lib64/qt6/bin/qsb on my system (gentoo, only built with amd64 targets whenever possible)

I've personally solved this by symlinking the lib64 qsb to the appropriate path required by the plasmoid. You may want to consider using the lib64 path as a fallback when appropriate qt6 binaries don't exist under /usr/lib whenever possible to avoid people being confused about this in the future.